2020MNRAS.497L...1W


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST23:47:20

2020MNRAS.497L...1W - Mon. Not. R. Astron. Soc., 497, L1-L6 (2020/September-1)

Fainter harder brighter softer: a correlation between αox, X-ray spectral state, and Eddington ratio in tidal disruption events.

WEVERS T.

Abstract (from CDS):

We explore the accretion states of tidal disruption events (TDEs) using a sample of seven X-ray bright sources. To this end, we estimate the relative contribution of the disc and corona to the observed X-ray emission through spectral modelling, and assess the X-ray brightness (through αox, L_2 keV_, and fEdd,X) as a function of the Eddington ratio. We report strong positive correlations between αox and fEdd,bol; fEdd,X and fEdd,UV; and an anticorrelation for L_2 keV_ and fEdd,UV. TDEs at high fEdd,bol have thermal dominated X-ray spectra and high (soft) αox, whereas those at low fEdd,bol show a significant power-law contribution and low (hard) αox. Similar to X-ray binaries and active galactic nuclei, the transition between X-ray spectral states occurs around fEdd,bol ≃ 0.03, although the uncertainty is large due to the small sample size. Our results suggest that X-ray surveys are more likely to discover TDEs at low fEdd,bol, whereas optical surveys are more sensitive to TDEs at high Eddington ratios. The X-ray and optical selected TDEs have different UV and X-ray properties, which should be taken into account when deriving rates, luminosity, and black hole mass functions.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion disc - black hole physics - galaxies: active - galaxies: nuclei - transients: tidal disruption events

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 XMMSL1 J074008.2-853927 X 07 40 08.2 -85 39 27           ~ 26 0
2 NAME ATLAS 18nej ev 07 56 54.537 +34 15 43.61           ~ 35 0
3 ASASSN -19dj SN* 08 13 16.937 +22 38 53.80           ~ 19 0
4 NAME AT 2018hyz ev 10 06 50.871 +01 41 34.08           ~ 17 0
5 LEDA 43234 G 12 48 15.2244073438 +17 46 26.496619532   16.5       ~ 164 0
6 NAME AT 2019ehz ev 14 09 41.880 +55 29 28.10           ~ 13 0
7 2MASX J14460522+6857311 G 14 46 05.22573 +68 57 31.1080           ~ 7 0
8 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 69 0
9 NAME ATLAS 19klx ev 20 57 02.970 +14 12 15.86           ~ 19 0
10 NAME AT 2018fyk ev 22 50 16.10 -44 51 53.5           ~ 19 0

    Equat.    Gal    SGal    Ecl

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2021.05.15-23:47:20

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